System Installation
Create Bootable USB Drive
macOS
dd
How to Create a Bootable Ubuntu USB Drive, for Mac, in OS X
hdiutil convert -format UDRW -o system.img system.iso
diskutil list
diskutil unmountDisk /dev/disk2
sudo dd if=system.img.dmg of=/dev/rdisk2 bs=1m
# wait about 4 mins
diskutil eject /dev/disk2